Grammar to study at each CEFR level.

CEFR Level C1 means:

• you can understand a wide range of demanding, longer texts, and recognise implicit meaning.
• you can express him/herself fluently and spontaneously without much obvious searching for expressions.
• you can use language flexibly and effectively for social, academic and professional purposes.
• you can produce clear, well-structured, detailed text on complex subjects, showing controlled use of organisational patterns, connectors and
  cohesive devices.